||'''Book'''|| Getting started with MATLAB ||
 ||'''Author'''|| Rudra Pratap ||
 ||'''Edition'''||  ||

/* code_begins */

{{{
sage:var('y')
sage:contour_plot(-5/(1+x^2+y^2),(x,-3,3),(y,-3,3))
}}}

/* code_ends */

 * '''Solution by''': 
   * <ANIL NAIR>, <STUDENT>, <CHENNAI MATHEMATICAL INSTITUTE>
   * <Your Name>, <Profession>, <Organization>